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2. Using the optical connections
In addition to the eight analogue inputs, the Clarett 8Pre has an ADAT input port (OPTICAL IN) which
can provide an additional 8 audio inputs at 44.1/48 kHz sample rate, four at 88.2/96 kHz or two at
176.4/192 kHz. Using a separate 8-channel microphone preamplifier equipped with an ADAT output
– such as the Focusrite OctoPre MkII – provides a simple and excellent method of expanding the
Clarett 8Pre’s input capability.
Computer
running DAW
ocusrite Control
Inputs 1 & 2 on front panel
Optical ADAT connection (TOSLINK)
Optional
Wordclock link
Inputs 1 & 2 on front panel
Octopre MKII
8ch Mic Amp
The OctoPre MkII’s OPTICAL OUT port is connected to the Clarett 8Pre’s OPTICAL IN port with a
single TOSLINK optical cable. Stable word clock synchronisation may be achieved by connecting the
Clarett 8Pre’s WORD CLOCK output to the OctoPre MKII’s WORD CLOCK IN and setting the OctoPre
MkII to use this as its sync source; alternatively, the Clarett 8Pre may be set (in Focusrite Control) to
synchronise via the ADAT format signal at the OPTICAL IN port.
Note: when interconnecting two digital devices by any method, always ensure that both are set to use
the same sample rate.
The additional inputs realised by use of the optical port may be routed using Focusrite Control in
exactly the same manner as the other inputs. The additional inputs can form part of any musician’s
headphone mix, as required.
If a suitable D-to-A converter with an ADAT input is available, the OPTICAL OUT port may be used
in the opposite manner; for example, additional outputs from the DAW may be converted into the
analogue domain to allow the use of an external hardware mixing console to mix down a large
number of DAW tracks.
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